Some few are rated at less - maybe 500 mAh and a few at higher. Modern USB phone chargers which have a USB plug as their output and which plug into a device's USB port are chargers in their own right. A charger capable of charging a phone at 5V, 2A will almost certainly also charge a tablet OK at 5V, 2A.
The more months payed for upfront, the cheaper the cost per month. E-liquid subscriptions range in price form $29.99 paid monthly, $86.97 paid every three months or $167.94 paid every six months. All three plans include shipping in the price.
A decent active DI will set you back about Â£100 in the UK, but many people baulk at that when they see generic 'active DI' boxes going for Â£20 or so. However, the difference in sound quality is often very significant, and in my experience the better boxes are built to last. If you amortise the cost of a decent box over 10 years or more, it only costs Â£10 a year, and that's peanuts compared to your mics and other gear.